/* ===========================================================
   Shared styles for the app support site
   4 apps / multilingual / light + dark
   =========================================================== */

:root {
  --bg: #f5f5f7;
  --bg-card: #ffffff;
  --text: #1d1d1f;
  --text-muted: #6e6e73;
  --border: #e3e3e6;
  --accent: #0071e3;
  --accent-soft: #e8f1fd;
  --shadow: 0 1px 3px rgba(0, 0, 0, .06), 0 8px 24px rgba(0, 0, 0, .05);
  --radius: 18px;
  --maxw: 820px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --bg-card: #1c1c1e;
    --text: #f5f5f7;
    --text-muted: #98989d;
    --border: #2c2c2e;
    --accent: #2997ff;
    --accent-soft: #16314d;
    --shadow: 0 1px 3px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP",
    "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 17px;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Language visibility ---------- */
.lang-ja,
.lang-en,
.lang-ko,
.lang-zh-Hans { display: none !important; }

html[data-lang="ja"] .lang-ja,
html[data-lang="en"] .lang-en,
html[data-lang="ko"] .lang-ko,
html[data-lang="zh-Hans"] .lang-zh-Hans { display: revert !important; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  border-bottom: 1px solid var(--border);
}
.site-header .bar {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.site-header .home-link {
  font-weight: 600;
  font-size: 15px;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.site-header .home-link:hover { text-decoration: none; opacity: .7; }

/* ---------- Language toggle ---------- */
.lang-toggle {
  display: inline-flex;
  flex-wrap: wrap;
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  background: var(--bg-card);
}
.lang-toggle button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.lang-toggle button[aria-pressed="true"] {
  background: var(--accent);
  color: #fff;
}
@media (max-width: 560px) {
  .lang-toggle {
    border-radius: 14px;
    max-width: 100%;
  }
  .lang-toggle button {
    font-size: 12px;
    padding: 6px 10px;
  }
}

/* ---------- Layout ---------- */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 40px 20px 80px;
}

.hero {
  text-align: center;
  padding: 24px 0 8px;
}
.hero h1 {
  font-size: clamp(28px, 6vw, 40px);
  line-height: 1.2;
  margin: 0 0 10px;
  letter-spacing: -.02em;
}
.hero .tagline {
  color: var(--text-muted);
  font-size: 18px;
  margin: 0;
}

h2 {
  font-size: 22px;
  margin: 48px 0 14px;
  letter-spacing: -.01em;
}
h2:first-of-type { margin-top: 36px; }

section p { margin: 0 0 14px; }

ul.feat { padding-left: 0; list-style: none; margin: 0 0 14px; }
ul.feat li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 10px;
}
ul.feat li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: .62em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

/* ---------- App grid (index) ---------- */
.app-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 28px;
}
@media (min-width: 560px) {
  .app-grid { grid-template-columns: 1fr 1fr; }
}
.app-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease;
  color: var(--text);
}
.app-card:hover {
  text-decoration: none;
  transform: translateY(-3px);
  box-shadow: 0 4px 8px rgba(0,0,0,.08), 0 14px 36px rgba(0,0,0,.10);
}
.app-card img {
  width: 68px;
  height: 68px;
  border-radius: 16px;
  flex: 0 0 auto;
  box-shadow: 0 1px 2px rgba(0,0,0,.12);
}
.app-card .name { font-weight: 600; font-size: 17px; margin: 0 0 2px; }
.app-card .desc { color: var(--text-muted); font-size: 14px; margin: 0; line-height: 1.5; }

/* ---------- App page header ---------- */
.app-head {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 8px;
}
.app-head img {
  width: 84px;
  height: 84px;
  border-radius: 19px;
  box-shadow: 0 1px 3px rgba(0,0,0,.15);
  flex: 0 0 auto;
}
.app-head h1 { font-size: clamp(24px, 5vw, 32px); margin: 0 0 4px; letter-spacing: -.02em; }
.app-head .sub { color: var(--text-muted); margin: 0; font-size: 16px; }

/* ---------- Cards / boxes ---------- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px 22px;
  box-shadow: var(--shadow);
  margin-top: 14px;
}

/* ---------- FAQ ---------- */
.faq details {
  border-bottom: 1px solid var(--border);
  padding: 4px 0;
}
.faq details:last-child { border-bottom: 0; }
.faq summary {
  cursor: pointer;
  font-weight: 600;
  padding: 14px 28px 14px 0;
  position: relative;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 12px;
  font-weight: 400;
  font-size: 20px;
  color: var(--text-muted);
  transition: transform .2s;
}
.faq details[open] summary::after { content: "\2212"; }
.faq .answer { padding: 0 0 16px; color: var(--text); }
.faq .answer p { margin: 0 0 10px; }
.faq .answer p:last-child { margin-bottom: 0; }

/* ---------- Meta table ---------- */
.meta {
  width: 100%;
  border-collapse: collapse;
  margin-top: 6px;
}
.meta th, .meta td {
  text-align: left;
  padding: 12px 4px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  font-size: 15px;
}
.meta tr:last-child th, .meta tr:last-child td { border-bottom: 0; }
.meta th { width: 38%; color: var(--text-muted); font-weight: 600; }

/* ---------- Contact ---------- */
.contact-box {
  background: var(--accent-soft);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-top: 16px;
  text-align: center;
}
.contact-box .mail {
  font-size: 18px;
  font-weight: 600;
  word-break: break-all;
}
.contact-box .note { color: var(--text-muted); font-size: 14px; margin-top: 6px; }

/* ---------- Badges ---------- */
.badges { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 0; }
.badge {
  font-size: 12.5px;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
}

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--border);
  padding: 28px 20px 48px;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}
footer a { color: var(--text-muted); text-decoration: underline; }
footer .links { margin-bottom: 10px; }
footer .links a { margin: 0 8px; }

/* ---------- Back link ---------- */
.back {
  display: inline-block;
  margin-bottom: 22px;
  font-size: 14px;
  color: var(--text-muted);
}
.back:hover { color: var(--accent); }